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rule win_protonbot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.protonbot." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.protonbot" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { e8???????? 68???????? 8d85f0feffff 50 8d85d4feffff 50 e8???????? } // n = 7, score = 400 // e8???????? | // 68???????? | // 8d85f0feffff | lea eax, [ebp - 0x110] // 50 | push eax // 8d85d4feffff | lea eax, [ebp - 0x12c] // 50 | push eax // e8???????? | $sequence_1 = { e8???????? 83c418 6804010000 8d85ecfeffff c745fc00000000 } // n = 5, score = 400 // e8???????? | // 83c418 | add esp, 0x18 // 6804010000 | push 0x104 // 8d85ecfeffff | lea eax, [ebp - 0x114] // c745fc00000000 | mov dword ptr [ebp - 4], 0 $sequence_2 = { c68574feffff00 8a01 41 84c0 75f9 2bca 8d85ecfeffff } // n = 7, score = 400 // c68574feffff00 | mov byte ptr [ebp - 0x18c], 0 // 8a01 | mov al, byte ptr [ecx] // 41 | inc ecx // 84c0 | test al, al // 75f9 | jne 0xfffffffb // 2bca | sub ecx, edx // 8d85ecfeffff | lea eax, [ebp - 0x114] $sequence_3 = { 0f4385d8feffff 50 8d85f0feffff 68ff000000 50 e8???????? 68???????? } // n = 7, score = 400 // 0f4385d8feffff | cmovae eax, dword ptr [ebp - 0x128] // 50 | push eax // 8d85f0feffff | lea eax, [ebp - 0x110] // 68ff000000 | push 0xff // 50 | push eax // e8???????? | // 68???????? | $sequence_4 = { 8bda 8bf9 8d8dd8feffff e8???????? 8d85f0feffff c745fc00000000 } // n = 6, score = 400 // 8bda | mov ebx, edx // 8bf9 | mov edi, ecx // 8d8dd8feffff | lea ecx, [ebp - 0x128] // e8???????? | // 8d85f0feffff | lea eax, [ebp - 0x110] // c745fc00000000 | mov dword ptr [ebp - 4], 0 $sequence_5 = { 8bcc 50 e8???????? e8???????? 8bcc } // n = 5, score = 400 // 8bcc | mov ecx, esp // 50 | push eax // e8???????? | // e8???????? | // 8bcc | mov ecx, esp $sequence_6 = { 8d8dd8feffff e8???????? 8d85f0feffff c745fc00000000 50 68ff000000 } // n = 6, score = 400 // 8d8dd8feffff | lea ecx, [ebp - 0x128] // e8???????? | // 8d85f0feffff | lea eax, [ebp - 0x110] // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 50 | push eax // 68ff000000 | push 0xff $sequence_7 = { c645e400 8bcf ff75e4 53 } // n = 4, score = 400 // c645e400 | mov byte ptr [ebp - 0x1c], 0 // 8bcf | mov ecx, edi // ff75e4 | push dword ptr [ebp - 0x1c] // 53 | push ebx $sequence_8 = { 68???????? c60100 e8???????? 83ec18 c645fc06 } // n = 5, score = 400 // 68???????? | // c60100 | mov byte ptr [ecx], 0 // e8???????? | // 83ec18 | sub esp, 0x18 // c645fc06 | mov byte ptr [ebp - 4], 6 $sequence_9 = { 8b1d???????? be02000000 66a3???????? 6a00 } // n = 4, score = 400 // 8b1d???????? | // be02000000 | mov esi, 2 // 66a3???????? | // 6a00 | push 0 condition: 7 of them and filesize < 1073152 }
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